'Will & Grace' turns 20: The cast through the years(69 images)

The first episode of "Will & Grace" aired 20 years ago on September 21, 1998. Here's a look back at the cast through the years.

Eric McCormack, who stars as Will Truman on "Will & Grace," holds up a picture of Elizabeth Taylor at the AMFAR awards ceremony and dinner gala held on Ellis Island on June 21, 2000 in New York City. File Photo by Laura Cavanaugh/UPI

Messing walks the red carpet at the Golden Globe Awards in Beverly Hills, Calif., on January 21, 2001. Messing was nominated for Best Performance by an Actress in a Television Series - Comedy or Musical for her role as Grace Adler in "Will & Grace." File Photo by Russ Einhorn/Star Max/UPI

McCormack (L) and wife Janet Holden walk the red carpet at the Golden Globe Awards in Beverly Hills, Calif., on January 21, 2001. McCormack was nominated for Best Performance by an Actor in a Television Series - Comedy or Musical for his role as Will Truman on "Will & Grace." File Photo by Russ Einhorn/Star Max/UPI